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bpf: don't enable preemption twice in smap_do_verdict

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In smap_do_verdict(), the fall-through branch leads to call
preempt_enable() twice for the SK_REDIRECT, which creates an
imbalance. Only enable it for all remaining cases again.

Fixes: 174a79ff95 ("bpf: sockmap with sk redirect support")
Reported-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Daniel Borkmann 2017-08-17 17:22:36 +02:00 committed by David S. Miller
parent 8c37bc677a
commit 976d28bfd1
1 changed files with 2 additions and 1 deletions
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3
kernel/bpf/sockmap.c
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@ -135,7 +135,8 @@ static void smap_do_verdict(struct smap_psock *psock, struct sk_buff *skb)
/* Fall through and free skb otherwise */ /* Fall through and free skb otherwise */
case SK_DROP: case SK_DROP:
default: default:
preempt_enable(); if (rc != SK_REDIRECT)
preempt_enable();
kfree_skb(skb); kfree_skb(skb);
} }
} }